Thank you for viewing! Vibration Style Ball Used only once. Color: Navy Model Number: SLB-100 Body Size (approx.): Diameter: 10cm (max), 8cm (min) AC Adapter Cord Length (approx.): 1.8m Color: Navy Weight (approx.): Body: 345g, AC Adapter: 84g Materials: Body: ABS resin, Silicone rubber Power Source: Rechargeable (Lithium-ion polymer battery 3.7V 2000mAh) AC Adapter (for charging): Input: AC100-240V 50-60Hz, Output: DC5V 1A Charging Time (approx.): 3 hours Operating Time (approx.): About 2 hours (vibration level 5, room temperature 23°C) Vibration Speed: Level 1: approx. 1,800 rpm, Level 2: approx. 2,200 rpm, Level 3: approx. 2,600 rpm, Level 4: approx. 3,000 rpm, Level 5: approx. 3,500 rpm Recommended Operating Temperature: 15°C to 35°C